Amathini E-Aluminium Aphrintiwe abukeka emangalisa emashalofini, nokho amaningi ahlushwa ukuphephuka, ukuxebuka, noma ukuqhekeka. Lawa maphutha alimaza isithombe somkhiqizo, anciphisa ukuzethemba kwabathengi, futhi andise imfucuza yokusebenza. Kulesi sihloko, uzofunda izimbangela ezibalulekile zalezi zinkinga futhi uthole izixazululo ezisebenzayo zokuqinisekisa ukuphrinta okuhlala njalo, kwekhwalithi ephezulu.
Ukuqonda Izimbangela Eziyinhloko Zokucweba Nokucwecwa
Amafutha Ayinsalela kanye Nokungcoliswa komhlaba
Ngesikhathi sokukhiqiza, amafutha kanye nama-wax e-necking asetshenziswa ekubumbeni amathini. Lezi zinto zivame ukuhlala entanyeni, ehlombe, kanye ne-chime, okudala imigoqo evimbela o-ink ekubambeni ngendlela efanele. Ngokuhamba kwesikhathi, lezi zinsalela zilimaza ukuqina kokuphrinta ngaphansi kokuthutha, isiqandisi, nokuphathwa. Ngisho namanani amancane kawoyela anganciphisa amandla okunamathela, enze i-can ivele ithande ukuphephuka nokuxebuka.
Imikhiqizo kufanele ihlole izindawo ezinengcuphe ephezulu yamafutha ayinsalela ngaphambi kokuphrinta. Izindlela zokuhlanza ezifana ne-solvent wipes noma imithi yokwelapha nge-plasma isusa lokhu kungcola ngokuphumelelayo. Amaphrinta edijithali aziba lesi sinyathelo engcupheni yokukhiqiza amathini anezinkinga zokunamathela eziphindelelayo.
Ukwelashwa Kwendawo Enganele
Ukulungiswa kwendawo kuyisinyathelo esibalulekile ekuvimbeleni ukwehluleka ukunamathela. Amasu afana nelangabi, i-plasma, noma ukwelapha kusengaphambili kwamakhemikhali akhuphula amandla angaphezulu futhi athuthukise ukubopha kukayinki. Izindawo ezingalashiwe zivame ukuba nezinkinga zokunamathela, njengoba uyinki awukwazi ukungena ku-aluminium substrate ngempumelelo.
Izindlela zokuqinisekisa, ezihlanganisa ukuhlola amandla angaphezulu kanye nokuhlolwa kwe-tape-pull, ziqinisekisa ukuthi ukulungiswa kube yimpumelelo yini. Amathini anokwelashwa okunganele okungaphezulu kunamathuba amaningi okuthi agobe, acwebe, noma acwebe ngesikhathi sokugcina noma ethuthwa. Ukuqinisekisa ukwelashwa okufanayo kuzo zonke izindawo ze-can kunciphisa amaphuzu abuthakathaka.
Ukwakhiwa kukayinki kanye Nokuhambisana
Akuwona wonke ama-inki asebenza ngokulinganayo kuma-aluminium substrates. Oyinki be-UV/LED abalaphekayo ngokuvamile banikeza ukunamathela okungcono, ukumelana nemihuzuko, nokumelana nomswakama kunoyinki osuselwe emanzini. Ukusebenzisa u-inki ongahambelani kungaholela ekuphepheni kokuqala, ukuxebuka, noma ukuchotshozwa.
Iziqalo noma izendlalelo ezikhuthaza ukunamathela ziqhubeka ziqinisa isibopho phakathi kukayinki nekani. Lezi zingqimba zibalulekile ezinkingeni zokunamathela zamathini e-aluminium aphrintelwe ngokwedijithali. Imikhiqizo kufanele iqinisekise ukuthi isistimu kayinki ekhethiwe iyahambisana nakho kokubili i-primer kanye ne-aluminium substrate ukuze kuzuze ukuqina okuphezulu.
Ukwelapha kanye Nokomisa Inqubo
Ukwelashwa okufanele kubalulekile ekunamatheleni kwe-ink-substrate. Oyinki abangaphekiwe kahle bakha amabhondi abuthakathaka, okwandisa amathuba okuhluleka kokuphrinta. Oyinki abahlukene badinga amapharamitha athile okwelapha, okuhlanganisa isikhathi sokuchayeka, ukuqina, kanye nezinga lokushisa elingaphezulu.
Ukulungiselela ukwelapha kuqinisekisa ukuthi isendlalelo sokuphrinta simelana nengcindezi yemishini, izinguquko ezishisayo, nokuchayeka komswakama. Iphinde ivimbele ukuxebuka ngaphambi kwesikhathi kanye nokuphephuka. Ukuqapha ukusebenza kokwelapha ngesikhathi sokukhiqiza kuvumela abakhiqizi ukuthi bagcine ikhwalithi engaguquki.
Izimo Zemishini Nezemvelo
Izinselele Zokuphatha Nezokuthutha
Amaphrinti edijithali ahlangabezana nengcindezi evela kustaki, ukuthumela ukudlidliza, nokuphatha abathengi. Izindawo ezinokunamathela okubuthakathaka ngezokuqala ezibonisa ukubhakuzisa noma ukuchopha. Ngisho nokushaqeka okuncane kwemishini kungonakalisa ikhwalithi yokuphrinta uma ukulungiswa kwangaphambilini noma izinyathelo zokwelapha bezingenele.
Amabhrendi kufanele alingise izimo zokuphatha zomhlaba wangempela ukuze ahlonze izindawo ezingaba buthaka. Onjiniyela bokupakisha bangalungisa ukubekwa kokuphrinta noma ukujiya kwesendlalelo ukuze banciphise ukuchayeka ezifundeni ezinengcindezi ephezulu.
Ukuhlukahluka Kokushisa Nomswakama
Ukushintshashintsha kwezinga lokushisa kanye nomswakama kuthinta ukunamathela. Imijikelezo yokuphola, yokuqhwaza, noma yokushibilika ingenza buthaka amabhondi kayinki. Ukujiya komswakama futhi kusheshisa ukuxebuka ezindaweni ezino-inki onganele wokwelapha.
Amathini e-aluminium aphrintiwe ahlala isikhathi eside adinga o-inki nama-primer aklanyelwe ukumelana nengcindezi eshisayo neyomswakama. Ukuqapha izimo zemvelo ngesikhathi sokugcinwa nokusabalalisa kusiza ukuvimbela ukwehluleka ngaphambi kokuba kufinyelele kubathengi.
Can Geometry and Deformation
Idizayini ebonakalayo yekani inomthelela ekusabalaleni kwengcindezi. Izindawo ezinentamo, imithungo, namaphaneli agobile agxilisa ukuqina komshini. Izendlalelo zikayinki owugqinsi zisengozini enkulu yokuqhekeka noma ukuqhekeka phakathi nokuguqulwa.
Ukudizayina amaphrinti anokusabalalisa kwengcindezi efanayo kanye nokulawula ukujiya kweyinki kunciphisa ingcuphe yokucweba. Ukubekwa kwamaqhinga kwezithombe kugwema izifunda ezinengcindezi ephezulu, kugcine ikhwalithi ebonakalayo kuwo wonke umjikelezo wokuphila womkhiqizo.
![Amathini E-Aluminium Aphrintiwe]( "Printed Aluminum Cans")
Ukulungiselela Okungaphezulu Izindlela Ezinhle Kakhulu Zamathini E-Aluminium Aphrintiwe
Ukuhlanza Amaphrothokholi
Ukususwa ngokuphelele kwamafutha, ama-wax, nezinsalela kubalulekile. Izindlela ezifana nokusula i-solvent, ukwelashwa kwe-plasma, nokwelashwa kwelangabi ziqinisekisa ukuthi indawo ye-aluminium isilungele ukuphrintwa. Izindawo ezihlanzekile zivumela ama-inki ukuthi abambelele kahle futhi anciphise ingozi yokuxebuka.
Isicelo se-Primer kanye ne-Adhesion Layer
Ukusebenzisa i-primer ecacile noma isendlalelo sokunamathela kuqinisa isibopho se-inki-substrate. Ukuhambisana phakathi kwe-primer, inki, ne-aluminium kubalulekile ukuze kuqine. Ama-primed surface akhombisa ukumelana nokucindezela kwemishini, okushisayo, nokuswakama.
Isinyathelo |
Indlela |
Inhloso |
Ukuqinisekisa |
Ukuhlanza |
Sula i-solvent / i-plasma / ilangabi |
Susa amafutha kanye wax |
Ukuhlola okubonakalayo / ukuhlolwa kwamandla angaphezulu |
Isiqalo |
Sula isendlalelo sokubopha |
Thuthukisa ukunamathela |
Ukuhlolwa kwe-tape-donsa / ukunamathela |
Ukuqinisekisa |
Hlola kumathini amasampula |
Qinisekisa ukulungela |
Rekhoda imiphumela futhi ugunyaze inqwaba |
Ukuthuthukisa Uyinki Nezinqubo Zokwelapha
Ukukhetha Amasistimu Kayinki Aqinile
Ukukhetha isistimu kayinki efanele kubalulekile ekuzuzeni ukunamathela okuhlala isikhathi eside kumathini e-aluminium aphrintiwe. Oyinki be-UV/LED abalaphekayo basebenza kahle kakhulu, banikeza ukumelana okuphakeme nokuhuzuka, umswakama, ukuchayeka ekukhanyeni, kanye nengcindezi yokushisa. Ngokuphambene, oyinki abasekelwe emanzini bavamise ukuhluleka ezindaweni zensimbi ngenxa yokungahlangani kahle nokuqina okuphansi, okuholela ekuphepheni, ekuxebukeni, noma ekuqhekekeni ngokuhamba kwesikhathi. Amabhrendi kufanele abeke phambili oyinki abakhelwe ngokukhethekile amathini eziphuzo ukuze kuqinisekiswe ukusebenza okufanayo ngaphansi kokucindezeleka komshini, kwemvelo, nokuphatha.
Ukuqinisekisa Ukwelashwa Okugcwele
Ukwelashwa okufanele kubalulekile ukuze kuthuthukiswe isibopho esiqinile phakathi kukayinki ne-aluminium substrate. Ukwelapha okungaphelele kushiya amaphuzu abuthakathaka angenwa kalula kalula noma ukuxebuka ngesikhathi sokugcinwa, ukuthutha, noma isiqandisi. Amapharamitha afana nesikhathi sokuchayeka, ukuqina kokukhanya, nogqinsi lukayinki kufanele kulungiswe ngokuya ngejometri ye-can, isivinini sokukhiqiza, kanye nekhemistri ye-inki ethize. Izinqubo zokuqinisekisa njengemigqa yokuhlola noma ukuhlaziywa kwe-spectroscopic kungaqinisekisa ukwelashwa okuphelele, kuqinisekiswe ukuthi amaphrinti ahlala eqinile ukusuka emugqeni wokukhiqiza ukuya kumthengi.
Ukujiya Kwesendlalelo Nokucatshangelwa Kwedizayini Yokuphrinta
Ukujiya kwesendlalelo kanye nokwakheka kwesithombe kuthinta ngokuqondile ukuqina kwemishini kwamathini e-aluminium aphrintiwe. Izendlalelo zikayinki eziwugqinsi kakhulu, ikakhulukazi ezindaweni ezinengcindezi ephezulu njengemithungo, amahlombe, noma amaphaneli agobile, ajwayele ukuqhekeka noma ukuqhekeka ngaphansi kokuguqulwa. Abaklami kufanele basabalalise uyinki ngokulinganayo, banciphise ukugxilisa ingqondo ngenkathi begcina izithombe ezigqamile. Ukubekwa kwamaqhinga kwemiklamo esindayo kude nezifunda ezizwelayo ngokusebenza kunciphisa futhi ingcuphe yokuphephuka, kuqinisekisa ukuthi amathini aphrintiwe agcina ukukhanga okubonakalayo kanye nobuqotho besakhiwo kuwo wonke umjikelezo wabo wokuphila.
Isichasiselo: Inhlanganisela yoyinki abaqinile, ukuphulukiswa okuthuthukisiwe, kanye nedizayini ehlakaniphile iqinisekisa ukuthi amathini e-aluminium aphrintwe ngokwedijithali agcina ukunamathela ngaphansi kokucindezelwa komshini, kwemvelo, nokuphatha, okulondoloza ubuhle bomkhiqizo.
Ukucatshangelwa Komhlinzeki Nokukhiqiza
Ukuhlola Ozakwethu Bokuphrinta I-Digital Can
Ukukhetha umphakeli ofanele wokuphrinta amathini edijithali kuyisici esibalulekile ekuqinisekiseni ukunamathela kwesikhathi eside. Amabhrendi kufanele asebenzisane nozakwethu ababonisa izilawuli zenqubo ezifakazelwe, okuhlanganisa ukulungiswa okungaguquki kwendawo, ukusetshenziswa kwe-primer, nezindlela zokupholisa uyinki. Abahlinzeki kufanele banikeze imiphumela ephindaphindekayo kukho konke ukukhiqiza okuningi, okuqinisekiswe ukuhlolwa okunamathiselwe okubhaliwe kanye namarekhodi okusebenza omlando. Ukukhetha umphakeli onolwazi lobuchwepheshe kusiza ekuvimbeleni ukuphehla okubizayo, ukuxebuka, noma ukuchotshozwa, kuyilapho kugcinwa ukubukeka okuphezulu nokusebenza kahle.
Ukuhlola Nokuqinisekisa Ikhwalithi
Ukuhlola okuphelele nokuqinisekiswa kwekhwalithi kuyisihluthulelo sokuqinisekisa ukuqina kokunamathela. Ukulingisa kwengcindezi yomhlaba wangempela, okuhlanganisa ukubamba ngomshini, imijikelezo yokushisa, ukuchayeka komswakamo, nokucindezela kokunqwabelanisa, kuveza amaphuzu angaba buthaka emathini aphrintiwe. Ukuqapha okuqhubekayo kanye nemibhalo kuqinisekisa ukuthi ukukhiqiza kuhlala ngaphakathi kwamazinga ekhwalithi achaziwe. Ukufaka amasheke okunamathela okuvamile, ukuhlolwa kokuklwebheka, nokuhlolwa kwe-tape-pull kunganqanda amaqoqo anesici ukuthi angafinyeleli emakethe, kuvikele isithunzi somkhiqizo kanye nokunciphisa imfucuza.
Ukuhlelwa Kwevolumu Nobude Obude
Ukuvumelana nezimo zokuphrinta kwedijithali kufanele kuhambisane nesikali sokukhiqiza nokucatshangelwa kobude bobude. Imiklamo emifushane, eguquguqukayo iyazuza ezinqubweni zedijithali ngokunika amandla ukwenza ngokwezifiso okusheshayo nezinguquko zedizayini. Kodwa-ke, ukukhiqizwa kwevolumu ephezulu kudinga ukwenziwa kahle kwenqubo ukuze kugcinwe ikhwalithi yokunamathela. Amabhrendi kufanele ahlole umthamo wokukhiqiza, i-geometry, namandla esistimu kayinki lapho kuhlelwa. Ukulinganisa ukuguquguquka kwedizayini nokuqina nokusebenza kahle kuqinisekisa ukuthi amathini aphrintiwe ngedijithali ahlangabezana kokubili nezidingo zobuhle nokusebenza.
Ukunciphisa Ukwehluleka Ukunamathela Ekusebenzeni
Ukuqhuba Imigijimo ye-Pilot
Ukuqaliswa kokukhiqizwa komshayeli kubalulekile ukuze kuqinisekiswe ukusebenza kokunamathela ngaphansi kwezimo zomhlaba wangempela. Lezi zivivinyo zivumela amabhrendi nabakhiqizi ukuthi bahlole izindlela zokulungiswa kwendawo, ukukhetha ama-primer, amasistimu kayinki, kanye nemingcele yokwelapha. Ukubuka okuvela ekuhlolweni kokuhlola kunika amandla ukulungiswa kwezivumelwano zokukhiqiza, okuqinisekisa ukuthi umjaho ogcwele uhlangabezana nokulindelwe ukuqina. Ukufaka idatha yokuhlola ekuhlelweni kokukhiqiza kunciphisa amathuba okuhluleka okukhulu, ukuvikela ubuqotho bomkhiqizo kanye nokunciphisa ukuphazamiseka kokusebenza.
Ukusebenzisa Ukuhlola Ikhwalithi Yokuvimbela
Ukuhlolwa kwekhwalithi okusebenzayo kubalulekile ukuze kutholakale ngokushesha ubuthakathaka bokunamathela. Ukuhlolwa kwe-tape-pull okujwayelekile, ukuhlolwa kokuklwetshwa, nezifaniso zokunqwabelanisa kuhlonza okungase kube nokuqubuka noma ukuxebuka ngaphambi kokukhiqizwa kwesilinganiso esigcwele. Ukungenelela kusenesikhathi kuvumela izinyathelo zokulungisa ezifana nokulungisa izingqimba zikayinki, amapharamitha wokuphulukisa, noma ukufakwa kwe-primer, ukuvimbela ukonakala okumba eqolo kanye nokugcina ikhwalithi yomkhiqizo engaguquki. Ukuqapha njalo kusiza ukugcina ukwethenjwa kwekhasimende futhi kugwema isikhathi sokungasebenzi esibangelwa amathini angasebenzi.
Izinqubo Zokuphatha Nokugcina
Ukuphatha nokugcinwa ngendlela efanele kuthonya kakhulu ukuphila isikhathi eside kwamathini anyatheliswe ngedijithali. Imihlahlandlela yokupakisha, ukupholisa, nokuthutha inciphisa ukucindezelwa kwemishini okungenza buthaka ukunamathela. Ukulawula indawo ezungezile, okuhlanganisa izinga lokushisa kanye nomswakama, kuvimbela ukuwohloka kukayinki ngaphambi kwesikhathi noma ukuxebuka. Ukuqinisekisa izimo ezingaguquguquki kusukela ekukhiqizeni kuye ekuthengiseni kusiza ekugcineni ubuqotho bokuphrinta, kunwebe impilo yeshalofu futhi kuthuthukise ukuzizwisa komthengi.
Imikhiqizo Yesikhathi Eside Nezinzuzo Zokusebenza
Ukugcina Ukungaguquguquki Okubonakalayo
Amaphrinti ahlala isikhathi eside athuthukisa umbono womkhiqizo ngokuqinisekisa ihluzo ezingashintshi ukusuka ekukhiqizeni kuye ekusetshenzisweni. Uyinki onamathele kahle umelana nengcindezi yemishini, isiqandisi, nokudlidliza komkhumbi, kugcina okubonakalayo kuqinile. Lokhu kuvumelana kuqinisa isikhalazo seshalofu, ukuzethemba komthengi, kanye nokuma kwebhrendi okuyi-premium. Izinkampani ezibeka phambili ukunamathela kanye nekhwalithi yokwelapha zidala umbono ohlala njalo ngenkathi zigwema izikhalazo zamakhasimende ezihlobene nokupakishwa okulimele.
Ukunciphisa Imfucuza Yokusebenza
Ukunamathela okuqinile kunciphisa ukusebenza kabusha namathini anqatshiwe, kunciphisa udoti osebenzayo kanye nezindleko. Izilawuli zenqubo ezingaguquguquki zivimbela ukubhakuzisa, ukuxebuka, noma ukuhlephuka ngesikhathi sokugcwalisa, ukupakisha, kanye nokuthutha. Ukuphathwa kwekhwalithi okusebenzayo akuvikeli kuphela amashejuli okukhiqiza kodwa futhi kuthuthukisa ukusetshenziswa kwensiza. Ngokuvimbela amathini anesici ukuthi angangeni ekujikelezeni, amabhrendi afinyelela ukusebenza kahle okuphezulu futhi anciphise umthelela wendawo.
Ukusimama kanye Nokugaywa kabusha
Ukuphrinta kwe-Direct-to-can kuqeda isidingo samalebula noma imikhono, ukuthuthukisa ukusebenziseka kabusha kanye nokunciphisa ukusetshenziswa kwezinto ezibonakalayo. Ukuhlanganisa lokhu namaphrinti ahlala isikhathi eside kuqinisekisa ukuthi ukupakishwa kuhlala kuphelele kulo lonke uchungechunge lokuhlinzeka, ukuqondanisa imigomo yokusimama nokuthembeka kokusebenza. Imikhuba yokukhiqiza eqaphela imvelo ebhangqwe nemifanekiso ehlala isikhathi eside iqinisa ukwethembeka komkhiqizo futhi isekela imizamo yebhizinisi yesibopho somphakathi.
Isiphetho
Ukucweba, ukuxebuka, kanye nokuchopha kuwumphumela wokungalungiseki kahle kwendawo, oyinki abangasebenzisani, kanye nezinkinga zokwelapha. I-Shandong Jinzhou Health Industry Co., Ltd. iqinisekisa Amathini E-Aluminium Aphrintiwe aqinile ngokuhlanza okunembile, ukufaka i-primer, kanye nokwelapha okulungiselelwe. Imikhiqizo yabo iletha ukunamathela okuhlala isikhathi eside, inciphisa imfucuza, futhi igcina isikhalazo seshalofu, ihlinzeka ngenani elithembekile lemikhiqizo.
FAQ
Q: Kungani amanye amathini aphrintwe ngokwedijithali ephephuka noma ecwecwa?
IMP: Ukuphephuka nokuxebuka kuvame ukuvela ngenxa yokungalungiseki kahle kwendawo, oyinki abangahambisani, noma ukungondleki okwanele. Amathini E-Aluminium Aphrintiwe adinga ukuhlanzwa okufanele, i-primer, kanye ne-digital ethuthukisiwe yokuphrinta ukuphulukiswa kwe-inki nokuqina ukuze kuvinjelwe ukwehluleka ukunamathela.
Q: Yini ebangela izinkinga zokunamathisela amathini e-aluminium aphrintiwe ngedijithali?
A: Izinkinga zokunamathela zivela kumafutha ayinsalela, ama-wax, noma izindawo ezingalingani. Ukuqinisekisa ukulungiswa okuphelele kwendawo yamathini esiphuzo aphrintiwe edijithali nokusebenzisa oyinki abahambisanayo kunganciphisa kakhulu lezi zinkinga.
Q: Ngingawavimba kanjani amathini e-aluminium aphrintiwe ukuthi angaphehli?
IMP: Ukuhlanza indawo efanele, ukusetshenziswa kwe-primer, kanye nokuphulukiswa okuphelele koyinki wokuphrinta we-digital kungukhiye. Ukuhlolwa kwengcindezi okuvamile kuqinisekisa ukunamathela kwesikhathi eside kanye nokuqina kwamathini E-Aluminium Aphrintiwe.
Q: Iyiphi indima edlalwa uhlobo lukayinki ekunamatheleni?
A: Oyinki be-UV/LED abalaphekayo banamathela kangcono kunoyinki osuselwe emanzini Kumathini E-Aluminium Aphrintiwe. Ukukhetha amasistimu kayinki ahlala isikhathi eside kuthuthukisa ukuklwejwa, umswakama, nokumelana nokukhanya, kuvimbela ukugqamuka noma ukuxebuka.
Umbuzo: Ingabe ukuphatha nokugcina kungathinta amathini e-aluminium aphrintiwe?
A: Yebo. Ukupakisha, ukudlidliza kwezokuthutha, noshintsho lokushisa kungenza buthaka ukunamathela. Amaphrothokholi okuphatha alawulwayo agcina ubuqotho bokuphrinta futhi anciphisa izinkinga zokunamathela zamathini e-aluminium aphrintiwe ngedijithali.
Q: Ingabe zikhona izinzuzo zokusebenzisa amathini e-aluminium aphrintiwe?
A: Amathini E-Aluminium Aphrintiwe avumela ihluzo ezigoqeke ngokugcwele, ukugijima okufushane, nemiklamo eguquguqukayo. Ukunamathela okulungile kuqinisekisa ukufana okubonakalayo, kunciphisa udoti osebenzayo, futhi kuthuthukisa ukukhanga komkhiqizo.
Q: Ngikuhlola kanjani ukunamathela kumathini aphrintiwe ngedijithali?
A: Yenza izivivinyo zokudonsa, ukuklwebha, kanye nezitaki kumathini amasampula. Lokhu kuhlola kwekhwalithi kuhlonza izindawo zokunamathela ezibuthakathaka kusenesikhathi, kuvimbela ukuvuleka okusabalele noma ukuxebuka Kumathini Aphrintiwe E-Aluminium.
Q: Ingabe isikali sokukhiqiza kanye nobunzima bokuklama kuthinta ukunamathela?
A: Yebo. Ukugijima kwevolumu ephezulu noma imiklamo enezingqimba eziwugqinsi ikhulisa ingcindezi kumayinki. Ukuqondanisa i-digital can ukuphrinta ukuphulukiswa kwe-inki nokuqina ngesikali sokukhiqiza kusiza ukuvimbela Amathini E-Aluminium Aphrintiwe ukuthi angabhakuzi.
